- RETRACTED ARTICLE: Step-Growth Annulative ?-Extension Polymerization for Synthesis of Cove-Type Graphene Nanoribbons
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Graphene nanoribbons (GNRs), nanometer-wide strips of graphene, are attracting significant attention in materials science as candidates for next-generation carbon materials. As their physical properties mainly depend on their structures, the precise synthesis of structurally well-defined GNRs is highly desirable to control their properties. Herein, we report a step-growth annulative ?-extension polymerization that allows for the rapid and modular synthesis of cove-type GNRs with pyrene and/or coronene diimide repeating units. The structures and photophysical properties of the separated GNRs were confirmed by various spectroscopic analyses. In addition, gas-blow-assisted uniform on-surface self-assembly of the GNRs was accomplished.
- Yano, Yuuta,Wang, Feijiu,Mitoma, Nobuhiko,Miyauchi, Yuhei,Ito, Hideto,Itami, Kenichiro
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Read Online
- Morphology-Tuned Activity of Ru/Nb2O5 Catalysts for Ketone Reductive Amination
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Amines are important compounds in natural products and medicines. Specifically, cyclopentylamine is one of the value-added chemicals widely used in the production of pesticides, cosmetics and medicines. In this work, three Ru/Nb2O5 catalysts with different Nb2O5 morphologies were used in the reductive amination of cyclopentanone under mild reaction conditions (90 °C, 2 MPa H2), among which 1 %Ru/Nb2O5?L catalyst exhibits best performance with the yield of cyclopentylamine reaching 84 %. This catalytic system is stable and has not significant deactivation even after 5 runs in the durability test. In addition, this catalyst can be extended to a series of aldehydes/ketones. Further comprehensive characterizations (XPS analysis and CO-adsorption DRIFT) reveal that the electronic effect of Ru species can be ruled out; instead, the activity of the catalyst is strongly influenced by the geometric effect. Layered Nb2O5 material possesses the highest surface area, resulting in the highest Ru dispersion, and therefore shows the highest catalytic activity. The in-situ DRIFT-MS technique was also used to reveal and understand the reaction mechanism. It is found that Ru species play a key role in activating carbonyl groups. This study illustrates a promising application of Ru/Nb2O5-Layer catalyst in the synthesis of amine and provides an understanding to the reaction mechanism.
- Guo, Wanjun,Tong, Tao,Liu, Xiaohui,Guo, Yong,Wang, Yanqin
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p. 4130 - 4138
(2019/05/24)
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- Carborane-perylene diimide derivative and synthesis method thereof, sensing array based on derivative and preparation method and application of sensor array
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The invention discloses a carborane-perylene diimide derivative and a synthesis method thereof, a sensing array based on the derivative and a preparation method and an application of the sensor array,and belongs to the technical field of small-molecular fluorescent sensing thin film materials. The carborane-perylene diimide derivative is placed in a solution, is assembled into a fiber structure with relatively large specific surface, and then is transferred to different substrate surfaces, so as to obtain the sensing array composed of a variety of fluorescent thin films; the sensing array canbe sensitive to sense six important drug gases, and drug samples have no need of any treatment; at the same time, through array combination, the interference of common interferents is eliminated thoroughly. The operation is simple, and the reaction conditions are mild. The prepared fluorescent sensing thin film has good stability and long service life, and is an excellent drug gas sensing thin film array. With combination use of the thin film and commercial fluorescent instruments, the drug gases can be sensitively detected. In addition, the drug gas special detection instrument can be developed through the device of the sensing thin film.
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Paragraph 0132; 0138; 0139; 0143; 0160
(2018/04/02)
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- N -Annulated perylene diimide derivatives as non-fullerene acceptors for solution-processed solar cells with an open-circuit voltage of up to 1.14 v
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Three different non-fullerene small molecular acceptors containing N-annulated perylene diimide, named di-PNR, TPA-PNR and EDOT-PNR, were successfully designed and synthesized for photovoltaic applications. Introducing an electron donating unit such as tr
- You, Fei,Zhou, Xingbao,Huang, Hongyan,Liu, You,Liu, Sizhou,Shao, Jinjun,Zhao, Baomin,Qin, Tianshi,Huang, Wei
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supporting information
p. 15079 - 15087
(2018/09/29)
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- Non-fullerene acceptor engineering with three-dimensional thiophene/selenophene-annulated perylene diimides for high performance polymer solar cells
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We report two new propeller-shaped perylene diimide (PDI) acceptors based on tetraphenylethylene (TPE) as the core and flanked with S/Se-fused PDIs, named as TPE-PDI4-S and TPE-PDI4-Se. Compared to the sulfur-annulated counterpart, T
- Li, Gang,Wang, Shuaihua,Liu, Tao,Hao, Pin,Liu, Zhenhua,Li, Fengting,Yang, Lian-Ming,Zhang, Yu,Li, Dandan,Yang, Shufan,Zhao, Jianfeng,Li, Jiewei,Yan, He,Tang, Bo
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p. 12601 - 12607
(2018/12/10)
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- Synthesis, characterization, and photophysical study of fluorescent N-substituted benzo[ghi]perylene "swallow tail" monoimides
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A set of N-substituted benzoperylene monoimide (BPI) fluorophores was synthesized and characterized structurally and photophysically. Condensation of benzo[ghi]perylene-1,2-dicarboxylic anhydride in the presence of "swallow tail" alkyl amines produced fluorophores that are soluble in a range of organic solvents, highly absorbing in the near-UV (ε334 = 79 000 M-1cm-1), and fluorescent in the visible range. Photophysical behavior of the compounds was studied with steady-state and time-correlated single photon counting. The synthesized BPIs exhibit positive solvachromatic emission (λem (hexane) = 469 nm; λem (ethanol) = 550 nm) as a function of solvent polarity with little change in their excited-state lifetime (9.6-6.5 ns) and fluorescence quantum yield (0.27-0.44) over the polarity range studied. Solvachromatic shifts were analyzed using the Lippert-Mataga approach. In nonpolar hydrocarbon solvents evidence of dual emission from closely spaced (562 cm-1) S1 and S2 excited states is observed. Preliminary peak assignments for the anomalous S2 emission are made.
- Manning, Steven J.,Bogen, William,Kelly, Lisa A.
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experimental part
p. 6007 - 6013
(2011/10/09)
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- Novel NIR-absorbing conjugated polymers for efficient polymer solar cells: Effect of alkyl chain length on device performance
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Three low bandgap conjugated polymers, i.e., PDTPBT-C8, PDTPBT-C6 and PDTPBT-C5, which consist of alternating N-alkyl dithieno[3,2-b:2′, 3′-d]pyrrole and 2,1,3-benzothiadiazole units and carry 1-octylnonyl, 1-hexylheptyl and 1-pentylhexyl as side chains,
- Yue, Wei,Zhao, Yun,Shao, Shuyan,Tian, Hongkun,Xie, Zhiyuan,Geng, Yanhou,Wang, Fosong
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experimental part
p. 2199 - 2206
(2010/04/05)
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- Alkylenediamine derivatives
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Novel alkylenediamine derivatives effectively employable as glutamate blockers have the formula (I) or (II): STR1 wherein each of R1 and R6 is an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aryl group, or an aralkyl group; each of R2 and R7 is an aliphatic hydrocarbon group, an alkoxy group, an aliphatic hydrocarbon group containing an ester bonding, an aliphatic hydrocarbon group containing an ether bonding, or an aryloxy group; each of R3, R4, R5, R8, R9 and R10 is hydrogen, an alkyl group, an alkoxy group, an acyloxy group, an aryl group, an aralkyl group, hydroxyl, a hydroxylalkyl group, halogen, nitrile, nitro, amino, carbamoyl or alkoxycarbonyl; and each of m and n is an integer of 0-3 (m+n does not exceed 3); k is an integer of 1-4; each of p and i is an integer of 2-13; and each of q and j is an integer of 4-7.
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- Novel polystyrene anion exchange polymers
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Polystyrene polymers having a quaternized ammonium group and their use in a method of treatment of hypercholesterolaemia. A particular compound of the invention is N,N-dimethyl-N-dodecylammoniomethyl-substituted polystyrene.
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- Very Soluble and Photostable Perylene Fluorescent Dyes
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The synthesis of perylene dyes 2 with two terminal alkyl groups is described.Long-chain alkyl groups do not increase, but diminish solubility.Cycloalkyl substituents give a minimum of solubility with medium sized rings and a maximum with the cyclotetradecyl derivative (2p).Very high solubility in organic solvents is attained by substitution with secondary alkyl residues having two long chains.One of them, the dye with the 1-hexylheptyl substituent (2v), exhibits a solubility of more than 100g/l in most solvents, a fluorescent quantum yield of about 100 percent, and a very high photostability, thus making it suitable for special applications.
- Demming, Stefan,Langhals, Heinz
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p. 225 - 230
(2007/10/02)
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